Pump-piston



PUMP PISTON.

APPLICATION-FILED DEc.7, 1920.

1,388,254. Patented Aug. 23, 1921.

gvvuentoz H. L` C'. Hansen ersfon the-otherhandare'deiiected from the To all 'whom imag concern." Be it known vthat I,HA`Ns'-L. G; HANSEN,

asubject of the King of Denmark, residing at Chicago, in the county ofY Cook and State" `of Illinois, have invented certain new and useful Improvements in Pump-Pistons, and

I do-hereby declare the following to-be a full, clear, and `exact description of' the invention, such -as will-,enable others skilled in the art to. which it .appertains to make and use the same. z

The object-of the invention is to provide a simple, inexpensive and efficient piston for pumps and like devices andmore particularly those of the hand operated typefand more especially to provide f improved means forholding the piston c upin position and --preventing leakage around the c up or thepiston rod vto secure vthe Igreatest efficiency in theA` operation of thepump; and with this object lin view the invention consists in a construction 'and combination of which a referred embodiment is shown in the rawing;

igure' l'is a side view of a pum-p piston arranged in a cylinder and having cup retaining means constructed and arranged in accordance, with theinvention.

Fig. 2 'is a sectional view of the same. Fig. 3 is a plan view, and 1 Fig. 4 is a sectionalv view of-one of the-'- washers,

The invention resides essentially in the ywashers 1'0 and 11 which are disposed .iny

relativelyv 'reversed positions upon opposite sidesof the plane o a piston cup 12 of the ordinaryconstruction upon a piston rod 13,-

` cup during the returnor suction `StrOkeJand iso said parts being heldin place by the .usual nut 14 for use in a cylinder 15. In `order that the cup, may expand andA contract with the maximum eiiciencyf 1s preferred to employ an up er or` ,back1ng washer y10l which supports"` t ecu'p .1 2` dur-,

terthan the washer '1 -l which supports the to provide said-washers 10 -andflflfwithen- A Specicationfof Letters Patent.

yportionately increase .and 11 .10 and11,w1ll contact with said .cup lmember 12, at a plane ofthe bearing portions *x10*l and lll'f tov form 'the preferably convexed arcuate checking surfaces l()b the two washers, recede from each o ther towardtheir peripheries to permit of an* amplitude' of movement ofthe rim of the cup which gradually increases 'from its cen-v ter outward., The result` of this operationl under the power or driving stroke is. to

throw'the ange ofthe cup .promptly into expansive relation with the' inner surface of the cylinderand lon the reverse or suction 1 Patented Aug. 23, 192.1; Appli-cation led December-7,19%- .srialnm I v and l1b which, as t'o stroketo permit said flange to swing inward so asf Ato relieve the'pressure upon andffrictional contact wlth the surface of the.cy1'

inder-or barrel, to minimize `the friction-j'- and hence the wear upon the cupand pro-`-Y ciencythereof.' Obviouslyv on an exhaust pump the parts would be reversed'b'utthev the .durability and elfi? relation as tothe power stroke and. the re# These Vribs are shown pressing. or`- offsetting' a portion of -the'wash'-f erslO and 11, aroun the fiat central portionsl turn stroke will b e identical withthat above .l

'8. drawings, it wlll-be seen that the washers 10 and 11 are provided with concentric ribs 10 respectively ontheir eonvexfacea as being produced by 10* and .11'l of the washers 10' and 11', re-

spectively.Y It will be seen that when the washers 10and 11 are-'placed upon opposite sides of the main or central fiat portion ofv the piston cup or cup `"member 12, the ribs'l piston cup or cup member 12 andas the washers 10. and.-v l1 are tightened against the opposite sidesof .l

' said-cup member 12, these ribs" 10 and 11"' willbe forced into thejopposite sides of said ton rod v13,- thereby the cupmember 1 2 vrod 13'and prevent'the iiui from 'leaking point adjacent. the piSfseparating the fibers'of and forcing a' spreading on said pistoni;4

through the central opening ofthe cupmemev ber-l 2', around the-piston rod v13. Thefibers said bearin surfaces, being Y dat 1 or' cior'ru,

Agated and 1n vplanes erpendiculartethe ath of l'movement of t e-.pistoii orv plunger. he outer-'orperipheralportions of the wash- W'hich 'are .forced v,to vspread;'outwardly will he brought into close contact with thefouter'fvedge portions of the ribslfand 11 and the; adjacentp'ortions'of the v'vashers,1 0-a1'dv`1lgA thereby vpreventii igj the fluid v fromy passing :between the washers 10 andfll 'and the cup `Iemberv IQina-direction toward the piston posed to the opposite main portion of said cup member.

.piston rod.

. ber, and a. second washer of decrease diameter engaged with the opposite face of said main portion of the cup member,said second mentionedv washer having a convex face'op:

2. A pump piston comprising the com` bination with a cylinder andV a pistonrod within said cylinder, of a cup member having its 4flanged outer portion contacting with the innerjface of said cylinder, said cup member` being mounted on said piston rod, oppositely acting movement limiting wash# ers mounted on said piston rod on opposite sides ofthe main portionof'said cup member and having convex faces opposed to'said cup member',` said washers having flat cen-v` tral portions contacting with said cup member, .and means for securing said cup member and said Washers in position on said 3. A pumpv piston comprising the com#A .bination with a cylinder and a piston rod Within said cylinder, of a piston-cup mounted'on saidv piston rod, andhaving its annular flanged. portion of increased thicknesscon-A y `vtaffting with theinner wall of said cylinder,

a rbacking washer of concave-convex form mounted on said p1ston rod and having its convex face opposed to the outer face of the main portion. of said piston'ciip, said back- Aing washer having a flat central portion bearing against the central portion of s aid piston tcup said backing washer limiting movement7 of the piston cup vin one direction during one stroke of the piston, a second movement limiting washer of decreased diameter and of concavo-'coiivex form, said second movement limiting washer havin its convex face opposed to the inner. face o the main portion of said piston cup, said second movement .limiting washer having ai Hat central portion bearing against the central por' tion 'of said" piston cup, said second move- [ment limiting yvasher serving to limit movement of the vpiston cup in the reverse direction during the reverse stroke of the piston, andl means for retaining said piston cup and said washers in positionupon said piston rod.

v4. A pump piston comprising a piston rod, a .cup leather mounted on Said rod, and

a backing washer mounted on said rod on leachsideof said cup leather and having convex faces opposing the same, said. washershavingribs engaging said cup leather and clenchingit upon' lsaid rod to provide a liquid tight connection between l'said cup leather and` said' piston rod.

In testimony whereof I aix my signature in presence ofjtwo witnesses. A

y HANS L. C.' HANSEN.

Witnesses:

HAROLD'A. CLARK,- NORTON H. BYAM. 

